79716191 has 4 divisors (see below), whose sum is σ = 83911800. Its totient is φ = 75520584.

The previous prime is 79716181. The next prime is 79716193. The reversal of 79716191 is 19161797.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79716191 - 2⁶ = 79716127 is a prime.

It is a super-2 number, since 2×79716191² = 12709342215096962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79716193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097776 + ... + 2097813.

It is an arithmetic number, because the mean of its divisors is an integer number (20977950).

Almost surely, 2^79716191 is an apocalyptic number.

79716191 is a deficient number, since it is larger than the sum of its proper divisors (4195609).

79716191 is a wasteful number, since it uses less digits than its factorization.

79716191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195608.

The product of its digits is 23814, while the sum is 41.

The square root of 79716191 is about 8928.3924084910. The cubic root of 79716191 is about 430.3767943034.

The spelling of 79716191 in words is "seventy-nine million, seven hundred sixteen thousand, one hundred ninety-one".